1DBR:
reference: Crystal structures of Toxoplasma gondii HGXPRTase reveal the catalytic role of a long flexible loop., Schumacher MA, Carter D, Ross DS, Ullman B, Brennan RG, Nat Struct Biol 1996 Oct;3(10):881-7. PMID: 8836106

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).